We've been using baby wipes on our leather for about three years, guess what else I've been using them on for about three years?
They had no idea what kind of diet I'd give the couch when they said "feed the leather".
Milk sodden cheerios, peanut butter, smashed grapes, toast crumbs, jam smears, and a really slight haze of vegemite. You wouldn't believe how smooth and supple it is! Looks brand new! (except for the texta marks)